Ruby - Increases attack. Seems like with all stat increase CSC, it mostly increases the rate at which the stat grows- adding levels in the relevant stat 'does more'.

Sapphire - Increases accuracy.

Emerald - Increases dodge.

Topaz - Increases guard.

Garnet - Increases both attack and accuracy. The double stat increase CSC don't seem to be particularly better than the single ones, though. Apparently they may decrease the two stats they don't improve, and may not have as much of a benefit as the single ones.

One thing missing form here is the Japanese wiki seems to talk about "sense" a lot. always wondered what that referred to. Like I think it implied Cats Eye gave you shinki better AI with determining what range to move to before attacking. I was never sure of this, though.

catacyst wrote:Does anyone here know specific achievements that would give some of these CSCs? Particularly moonstone, as that seems quite awesome.

On a side note, is the moonstone even as good as I am led on to believe?

From achievements, the only way to get a moonstone is to complete achievements that give the "upper class 2 (アッパークラス2)" pack or "rare 1 (レア1)" pack. Basically, you do the achievement, and you get a random CSC from a set.